The most common reason your iPhone battery drains quickly is that one or two apps are running constantly in the background, or your screen brightness is set too high for your usage pattern
iPhone batteries degrade over time — after about 500 full charge cycles, a battery typically holds 80 percent of its original capacity. But sudden fast drain usually points to something you can fix right now: a misbehaving app, location services running when you don't need them, or settings that made sense for someone else's phone but not yours.
The fastest way to find out what's draining your battery is to open Settings, tap Battery, and look at Battery Usage. This screen shows you which apps have consumed power in the last 24 hours or the last 10 days. If one app is using 30 or 40 percent of your battery while you barely use it, that's your culprit. The second step is to check your screen brightness and whether background app refresh is turned on for apps that don't need it.
Key Takeaways
- Check Battery Usage in Settings to see which specific apps consumed the most power in the last 24 hours or 10 days.
- Screen brightness set to automatic or maximum drains battery much faster than a lower fixed brightness level.
- Background App Refresh lets apps update their content even when you're not using them — turn it off for apps you don't need constant updates from.
- Location services, especially when set to "Always" instead of "While Using", drain battery continuously even when the app is closed.
- If your battery health has dropped below 80 percent, your phone will drain faster than it did when new, and a battery replacement may be the only real fix.
How to read your Battery Usage screen and identify the problem app
Open Settings, scroll down and tap Battery, then tap Battery Usage. You'll see a list of apps ranked by how much power they used. The percentages add up to 100 percent of your battery drain since the last full charge. If Safari is at 45 percent, Safari consumed nearly half your battery. If an app you barely touch is in the top three, that's the one to investigate.
Tap any app in the list to see two numbers: the percentage of your total battery it used, and how much of that time it was actively on your screen versus running in the background. If an app shows "Background: 8h" but you only opened it for 5 minutes, it's running constantly even when you're not using it. That's the behavior to stop.
Turn off Background App Refresh for apps that don't need it
Background App Refresh is a setting that lets apps update their content, check for messages, or refresh data even when you're not looking at them. For a news app or email, this is useful. For a game or a calculator, it's just draining your battery for no reason.
Go to Settings, tap General, then Background App Refresh. You'll see a toggle at the top to turn it off entirely, or you can scroll down and turn it off for individual apps. If you turn it off for everything, you'll save battery but your email and messages may arrive a few minutes slower. A middle ground is to turn it off for apps you don't need constant updates from — games, photo editors, utilities — and leave it on for Mail, Messages, and any app you rely on for notifications.
Check Location Services and turn off "Always" for apps that don't need it
Location services use your phone's GPS, which is one of the biggest battery drains available. Some apps ask for location permission and then use it constantly, even when you're not actively using the app. Maps needs your location while you're navigating. A weather app does not need it while you're sleeping.
Go to Settings, tap Privacy and Security, then Location Services. You'll see a list of apps with a colored arrow next to each one. A purple arrow means the app used location in the last 24 hours. Tap each app and you'll see three options: Never, While Using, or Always. Set location to "While Using" for most apps — they'll know where you are when you open them, but won't drain battery in the background. Set it to "Never" for apps that don't need location at all. Only a few apps — Maps while actively navigating, or a fitness app while you're running — should be set to "Always".
Lower your screen brightness or turn off auto-brightness
Your screen is often the single biggest battery drain on your phone, especially if brightness is set to automatic or maximum. Auto-brightness adjusts your screen to match the light around you, which sounds smart but means your phone is constantly measuring the light and adjusting the backlight. A fixed brightness level at 40 or 50 percent uses less battery and is usually bright enough indoors.
Go to Settings, tap Display and Brightness. You'll see a brightness slider. Turn off "Auto-Brightness" by toggling it off, then set the slider to somewhere between 30 and 50 percent. Your screen will look dimmer at first, but your eyes adjust within a minute or two, and your battery will last noticeably longer. If you're outside in bright sunlight, you can always raise it temporarily — just don't leave it on automatic.
Check your battery health and whether your battery is degraded
After about two years of normal use, an iPhone battery loses capacity. You can see how much capacity your battery has lost by going to Settings, tapping Battery, then Battery Health and Charging. Look for the number next to "Maximum Capacity." If it says 85 percent, your battery holds 85 percent of the charge it held when new. If it says 60 percent, your battery is significantly degraded and will drain much faster than it should.
If your maximum capacity is below 80 percent, fast drain is partly just the age of your battery. You can still extend the time between charges by using the fixes above — lower brightness, fewer background apps, location off — but the real solution is a battery replacement. Apple and many repair shops can replace your battery for a fixed cost. Until then, use Low Power Mode (Settings > Battery > Low Power Mode) to reduce performance slightly and extend your battery life by 15 to 20 percent.
Disable notifications and reduce visual effects if you've tried everything else
Notifications wake up your screen and trigger processing, which costs battery. If you're getting dozens of notifications per hour, they add up. Go to Settings, tap Notifications, and review which apps are allowed to send you notifications. Turn off notifications for apps that don't need to interrupt you — games, shopping apps, social media if you don't rely on them for urgent messages.
Visual effects like animated wallpapers and parallax (the slight movement of your home screen when you tilt your phone) also drain battery. Go to Settings, tap Accessibility, then Display and Text Size, and turn on "Reduce Motion." This disables parallax and reduces animations throughout the system. It won't make a huge difference on its own, but combined with the other changes above, it adds up.
Frequently Asked Questions
Why does my battery drain faster in cold weather?
Cold temperatures slow the chemical reactions inside your battery, so it can't deliver power as quickly. Your phone may shut down at 20 percent battery because the battery can't supply enough current, even though it technically has charge left. Warm your phone up indoors and the battery will work normally again. This is temporary and doesn't damage the battery.
Does closing apps in the app switcher save battery?
No. Closing an app from the app switcher doesn't stop it from using battery — it just removes it from memory. The next time you open it, your phone has to reload it from storage, which actually uses more battery than leaving it in memory. The only way to stop an app from draining battery is to turn off Background App Refresh for that app or uninstall it.
Should I use Low Power Mode all the time?
Low Power Mode reduces performance — your phone runs slower and some features are limited — so it's meant for when you're running low on battery. Using it all the time will extend your battery life by 15 to 20 percent, but your phone will feel sluggish. Most people use it only when battery drops below 20 percent, or all day if they know they won't have a chance to charge.
Can I tell if an app has a battery leak or bug?
Yes — if an app shows high battery usage in Battery Usage but you barely opened it, and turning off Background App Refresh didn't help, the app itself may have a bug. Check the App Store to see if there's an update available. If there is, update the app. If the problem continues after updating, the app may have a genuine bug and you may need to uninstall it or contact the app's developer.
Does turning off WiFi and Bluetooth save battery?
Turning them off saves a small amount of battery, but not as much as lowering screen brightness or stopping a misbehaving app. WiFi actually uses less battery than cellular data, so turning off WiFi to save battery is usually the wrong choice. Bluetooth uses very little battery unless you're actively connected to a device. Turn them off only if you're not using them and you're trying to squeeze out every last percent.